The Obama administration readied economic sanctions against Russia on Tuesday as it formally announced an aid package of $1 billion in energy subsidies to Ukraine amid worries that Moscow would extend its military reach into the mainland of the former Soviet republic.

U.S. Secretary of State John Kerry arrived in Kiev for a five-hour show of support for the fledgling Ukraine government as it grapples with a military takeover of Crimea, a strategic, mostly pro-Russian region in the country’s southeast. Kerry also was to pay homage to the dozens of protesters who were slain Feb. 20 in anti-government demonstrations that days later ousted Ukraine President Viktor Yanukovych.

As Kerry arrived, the White House announced a package of energy aid, training for financial and election institutions, and anti-corruption efforts. U.S. officials traveling with Kerry also said the Obama administration is considering slapping Russia with unspecified economic sanctions as soon as this week.

Additionally, the officials said, the U.S. has suspended what was described as a narrow set of discussions with Russia over a bilateral trade investment treaty. It is also going to provide technical advice to the Ukraine government about its trade rights with Russia. The officials spoke on condition of anonymity because they were not authorized to be quoted by name before the official announcement was made.

Russian President Vladimir Putin pulled his forces back from the Ukrainian border on Tuesday yet said Moscow reserves the right to use all means to protect Russians in the country. He accused the West of encouraging an anti-constitutional coup in Ukraine and driving it onto anarchy and declared that any sanctions the West places on Russia will backfire.

Earlier, the Pentagon announced it was suspending military-to-military engagements with Russia, including exercises, bilateral meetings, port visits and conferences.

European leaders already are considering sanctions on exports of Russia’s natural gas, uranium and coal industries. U.S. sanctions likely would be similar to Europe’s.

Some Republicans in Congress were considering a possible package of “debilitating economic sanctions” to get Putin’s attention. House Foreign Affairs Committee Chairman Ed Royce said that the U.S. and Europe should act collectively to threaten the Russian stock market, economy and ruble if Russia doesn’t withdraw from Crimea.

“We can’t just keep talking,” Royce said Monday. “We need to do something.”

The European Union issued a Thursday deadline for Putin to pull back his troops from Crimea or also face a rejection of visa liberalization and economic cooperation negotiations that have long been in the works.

The U.S. officials traveling to Kiev said Washington is warily watching to see whether Russia will try to advance beyond Crimea.

They cited reports of Russian helicopters nearly flying into mainland Ukraine airspace before being intercepted by jets controlled by Kiev. The officials said it’s believed that as many as 16,000 Russian troops have deployed to Crimea, while Ukrainian forces amassed on both sides of an isthmus that separates the region’s peninsula from the mainland.

The officials also said there is no support currently within the Obama administration to eventually let Russia annex Crimea — a possibility that has been raised quietly amid questions about U.S. interests in the pro-Russian region. They said it is up to the Ukraine government to decide whether a referendum should be held to let the Crimean people decide their own fate.

Speaking Monday at a U.N. session in Geneva, Russian Foreign Minister Sergey Lavrov attempted to deflect blame back on the West. He defended the deployment of Russian troops in Ukraine as a necessary protection for his country’s citizens living there.

“Those who are trying to interpret the situation as a sort of aggression and threatening us with sanctions and boycotts, these are the same partners who have been consistently and vigorously encouraging the political powers close to them to declare ultimatums and renounce dialogue,” Lavrov said.

“This is a question of defending our citizens and compatriots, ensuring human rights, especially the right to life,” he said.

President Barack Obama on Monday described the Russian advance as a violation of international law. He called on Congress to approve an aid package for the new Ukrainian government and repeated earlier threats that the U.S. will take steps to hobble Russia’s economy and isolate it diplomatically if Putin does not back down.

“The strong condemnation that has proceeded from countries around the world indicates the degree to which Russia is on the wrong side of history,” Obama said.

(AP)